PEARL RIVER — As temperatures in the region reached into the 90s over the weekend and air-conditioner use skyrocketed, Orange and Rockland Utilities recorded its highest-ever demand for electricity on a Sunday.

The utility's system recorded a peak electric demand Sunday of 1,355 megawatts.

The all-time high record is 1,617 megawatts, set Aug. 2, 2006, a Wednesday.

O&R issued a heat watch for a fourth day on Monday.

The utility recommends the public use electricity efficiently, turning down or turning off air conditioning in empty homes and keeping doors closed if using room AC.

People with central air should block the vents in unused or vacant rooms, according to the utility.